SHUTTER SPEEDS AND LENS APERTURE
Your Konica Autoreflex-A3 has a metal Copal Square-S focal plane shutter, with the control dial conveniently
located on top of the camera. This unique shutter is noted for exceptional accuracy even under extremes of
temperature and climate, and is virtually impervious to damage or deterioration in normal use.
This shutter, because of its exceptionally fast (7.5 milliseconds) traverse time, permits use of electronic flash at
all speeds to and including l/125th second (this speed is marked in red on the shutter speed dial). Flashbulbs or
flash cubes are synchronized up to l/30th second.
At "B", the shutter remains open as long as the Release Button (I ) is depressed. (For details on taking Time
exposures, see page 30.)
Speeds may be changed at any time, whether or not the shutter is wound. If your camera will be out of operation
for several months, it's desirable to release me shutter to minimize tension. For anything less than several
months, however this Oration is not necessary.
Like your eye, your camera lens has an iris, generally called me
diaphragm.
Open it up, and it admits more
light; close it down, it admits less. The amount of light is indicated by
f/stops
(also known as "apertures"): f/2.8
admits half as much light as f/2; f/4 admits one-quarter as much as f/2, and so on.
4.butkus. org
When a Konica Automatic Hexanon lens is mounted on a Konica Autoreflex-A3, the iris or aperture
automatically
closes to the correct f/stop before the picture is taken. The needle in the viewfinder shows the
actual f/stop being set. After the exposure, the aperture automatically re-opens to me widest position, giving you
a brilliant image for easiest viewing and focusing.
Uncoupled lenses and accessories may also be used with your camera's metering system. (For details, see pages
15-16).
